<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        //获取<p class='demo'>hello JavaScript</p>内部文案
        const str = `<p class='demo'>hello JavaScript</p>`
        const reg = /^<.+>(.+)<.+>$/
        str1 = str.replace(reg, function (match, $1) {
            return $1
        })
        console.log(str1)


    </script>

</body>

</html>